Paso Galvarino is a constriction in Seno Ventisquero, a tidally-energetic Chilean fjord. The pass is about 1500 m long and constricts in width by about 90 % near its sill, which has a depth of about 8 m. A laterally-averaged numerical model is compared to ADCP and backscatter observations of the hydraulic flow near the sill, during maximum flood, the slack tide after the flood, maximum ebb, and the slack tide after the ebb. The model is also used to examine how the energy flux into the fjord is partitioned in the region of the constriction. Energy is removed from the surface tide near the sill and is largely dissipated near the sill. The model predicts that the internal tide is unimportant and that energy transport by advection is much more important than that due to radiation. Advection is significant only near the sill, however, and a counteracting surface flux develops that suppresses the influence of the advection.